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![[Post New]](/templates/default/images/icon_minipost_new.gif) 19 Mar 2008 09:01:46 IST
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ans 13
first multiply the 3rd row with b keeping one b outside the determinant
then add the 3rd row to the first row..........
then take out the b from 3rd row and cancel it with the b outside the detrminant
now multiply again 3rd row with a and subtract 2 nd row from third....
take the a out and cancel it agin like b.............hope u got it
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